ADDX

ADDX is a Singapore-headquartered digital securities exchange and private-markets investment platform, licensed by the Monetary Authority of Singapore for the issuance, custody and secondary trading of digital securities. Founded in 2017 as iSTOX, it tokenises and fractionalises private equity, private credit, hedge funds, structured products, fixed income and commercial paper so accredited investors can subscribe at roughly USD 10,000 rather than institutional minimums. Alongside the consumer web and mobile app, ADDX Advantage packages the same rails for wealth managers, brokers and external asset managers (EAMs), and the publicly documented ADDX Open API — an HMAC-signed REST surface of about 68 operations covering account and investor information, STO subscription and redemption, wallet, fiat and digital-asset flows, exchange order-book market data and investor reporting — lets those partners drive the platform from their own systems.

ADDX is listed with 1 API on the APIs.io network. Tagged areas include Digital Securities Exchange, Private Markets, Tokenization, Alternative Investments, and Wealth Management.

ADDX’s developer surface includes engineering blog, API reference, documentation, getting-started guide, signup flow, support, authentication, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

29.3/100 thin ▬ flat Agent 11/100 agent aware Front door AI 3/6 light Heartbeat 25/100 slowing Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API

Digital Securities ExchangePrivate Markets Tokenization Alternative Investments Wealth Management Capital Markets Fintech Digital Assets Investment Platform Singapore

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 29.3/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 6.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.4 / 15

Agent readiness — 11/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/addx/"><img src="https://apis.io/badge/addx/card.svg" alt="ADDX on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Access Clarity scores 35.5 — up to +12.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/addx/apis.yml: open an issue on github.com/api-evangelist/addx to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

ADDX Open API

Publicly documented REST API that connects an external system to the ADDX platform. Roughly 68 operations across five documented groups — Account Management (account, balance, E...

ADDX API pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Addx Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Addx Rate Limits

0 limits

RATE LIMITS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Addx Authentication

1 scheme

SECURITY

Addx Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

Conventions

ErrorCatalog

Lifecycle

DataModel

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Compliance

Compliance

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 4

The organization behind the API

Blog

BlogRSS

Website

Blog

Source (apis.yml)

aid: addx
name: ADDX
description: ADDX is a Singapore-headquartered digital securities exchange and private-markets investment platform, licensed
  by the Monetary Authority of Singapore for the issuance, custody and secondary trading of digital securities. Founded in
  2017 as iSTOX, it tokenises and fractionalises private equity, private credit, hedge funds, structured products, fixed income
  and commercial paper so accredited investors can subscribe at roughly USD 10,000 rather than institutional minimums. Alongside
  the consumer web and mobile app, ADDX Advantage packages the same rails for wealth managers, brokers and external asset
  managers (EAMs), and the publicly documented ADDX Open API — an HMAC-signed REST surface of about 68 operations covering
  account and investor information, STO subscription and redemption, wallet, fiat and digital-asset flows, exchange order-book
  market data and investor reporting — lets those partners drive the platform from their own systems.
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.addx.co/images/Social_Share_Hero_image2.png
url: https://raw.githubusercontent.com/api-evangelist/addx/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-09-07'
modified: '2026-10-06'
tags:
- Digital Securities Exchange
- Private Markets
- Tokenization
- Alternative Investments
- Wealth Management
- Capital Markets
- Fintech
- Digital Assets
- Investment Platform
- Singapore
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: ADDX Open API
  description: Publicly documented REST API that connects an external system to the ADDX platform. Roughly 68 operations across
    five documented groups — Account Management (account, balance, EAM investor, portfolio, transaction and wallet detail,
    plus STO subscription, subsequent-subscription and redemption flows for both self and EAM-managed investors), Market Data
    (aggregated order book, market depth, market state, token list, ticker feed, trade feed, account balances on the trading
    engine), Reporting (report types, report listing, downloads), Fiat Flow (bank-account management, document upload, fiat
    deposit and withdrawal with OTP confirmation, wealth-manager distribute/collect) and Digital Assets (balances, deposit
    addresses, withdrawal fees, email and mobile OTP, identity verification, withdrawal confirmation). Requests are signed
    with an HMAC-SHA256 X-Signature over the timestamp and HTTP method using a Key ID and secret passphrase the user generates
    in the platform's API Settings. The base URL is deliberately not published — ADDX issues it per environment and per use
    case on request — so the documented paths are relative to a host only a provisioned partner holds.
  humanURL: https://api-docs.addx.co/open-api/
  image: https://www.addx.co/images/Social_Share_Hero_image2.png
  tags:
  - Digital Securities Exchange
  - Private Markets
  - Wealth Management
  - Digital Assets
  - Capital Markets
  properties:
  - type: APIReference
    url: https://api-docs.addx.co/open-api/
  - type: Authentication
    url: authentication/addx-authentication.yml
  - type: Conventions
    url: conventions/addx-conventions.yml
  - type: ErrorCatalog
    url: errors/addx-problem-types.yml
  - type: Lifecycle
    url: lifecycle/addx-lifecycle.yml
  - type: RateLimits
    url: rate-limits/addx-rate-limits.yml
  - type: DataModel
    url: data-model/addx-data-model.yml
  - type: X-MCPServerCandidate
    url: mcp/addx-mcp.yml
common:
- url: https://addx.co/insights/
  type: Blog
- url: https://addx.co/insights/rss/
  type: BlogRSS
- type: DomainSecurity
  url: security/addx-domain-security.yml
- type: Website
  url: https://addx.co/
- type: DeveloperPortal
  url: https://api-docs.addx.co/open-api/
- type: APIReference
  url: https://api-docs.addx.co/open-api/
- type: Documentation
  url: https://addx.co/en/how-addx-works/
- type: GettingStarted
  url: https://addx.co/en/get-started/
- type: SignUp
  url: https://client.addx.co/register
- type: Login
  url: https://client.addx.co/login
- type: Support
  url: https://addx.co/en/contact-us/
- type: Blog
  url: https://addx.co/en/insights/
- type: TermsOfService
  url: https://documents.addx.co/ADDX_Platform_Rules.pdf
- type: PrivacyPolicy
  url: https://addx.co/en/privacy-policy/
- type: Conformance
  url: conformance/addx-conformance.yml
- type: Compliance
  url: conformance/addx-conformance.yml
- type: Authentication
  url: authentication/addx-authentication.yml
- type: Conventions
  url: conventions/addx-conventions.yml
- type: ErrorCatalog
  url: errors/addx-problem-types.yml
- type: Lifecycle
  url: lifecycle/addx-lifecycle.yml
- type: RateLimits
  url: rate-limits/addx-rate-limits.yml
- type: Plans
  url: plans/addx-plans-pricing.yml
- type: Packages
  url: packages/addx-packages.yml
- type: DataModel
  url: data-model/addx-data-model.yml
- type: LLMsTxt
  url: llms/addx-llms.txt
- type: X-MCPServerCandidate
  url: mcp/addx-mcp.yml
x-enrichment:
  date: '2026-09-07'
  status: enriched
  artifacts_added: 13
  pass: local-v3

ADDX API — frequently asked questions

Does ADDX have an API?

Yes. APIs.io lists 1 API from ADDX, including ADDX Open API.

How do I authenticate with the ADDX API?

ADDX uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Addx Authentication.

Is the ADDX API ready for AI agents?

ADDX has a Kin Score of 29.3 out of 100 (thin) and an Agent Readiness score of 10.8 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/addx"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/addx/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/addx/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.